2. Division-4 Section for concrete unit masonry, and masonry restoration and cleaning.

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1 SECTION WATER REPELLENTS PART 1 - GENERAL 1.01 RELATED DOCUMENTS A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division-1 Specification Sections, apply to this Section SUMMARY A. This Section includes surface preparation and application of clear water repellent coating to the following vertical and nontraffic horizontal exposed surfaces: 1. Exterior concrete unit masonry, and cast-in-place concrete elements indicated. B. Related Sections: The following sections contain requirements that relate to this Section: 1.03 SUBMITTALS 1. Division-3 Sections for concrete work including floor sealers and curing agents, and concrete restoration and cleaning. 2. Division-4 Section for concrete unit masonry, and masonry restoration and cleaning. 3. Division-7 Section "Joint Sealants" for joint fillers and sealants. A. Product data including manufacturer's specifications, surface preparation and application instructions, recommendations for water repellents for each surface specified, and protection and cleaning instructions. Include data substantiating that materials are recommended by manufacturer for applications indicated and comply with requirements. B. Certification by water repellent manufacturer that products supplied comply with local regulations controlling use of volatile organic compounds (VOC).

2 C. Material test reports from qualified independent testing agency indicating and interpreting test results relative to compliance of water repellents with Performance Requirements specified in the "Quality Assurance" article QUALITY ASSURANCE A. Installer Qualifications: Engage an experienced Installer who employs only persons trained and approved by water repellent manufacturer for installation of manufacturer's products. B. Manufacturer Qualifications: Firm experienced in manufacturing products similar to those indicated for this Project and that has a record of successful in-service performance. C. Regulatory Requirements: Comply with applicable rules of the pollutioncontrol regulatory agency having jurisdiction in the Project locale regarding volatile organic compounds (VOC) and use of hydrocarbon solvents. D. Performance Requirements: Indicate test results for water repellents on substrate simulating Project conditions as close as possible. Use same materials and methods of application to be used on the Project. 1. Absorption Tests: Comparison of treated and untreated specimens: a. Concrete Masonry Units: ASTM C 140.] 2. Water Vapor Transmission: ASTM E 96. Comparison of treated and untreated specimens. 3. Water Penetration and Leakage Through Masonry: ASTM E Chloride Ion Intrusion: National Cooperative Highway Research Program (NCHRP) Report 244, Series II tests for percent reduction of water absorption and percent reduction in chloride content in concrete PROJECT CONDITIONS A. Weather and Substrate Conditions: Do not proceed with application of water repellent (except with written recommendation of manufacturer) under any of the following conditions:

3 1.05 WARRANTY 1. Ambient temperature is less than 40 deg. F (4 deg. C). 2. Substrate surfaces have cured for less than one month. 3. Rain or temperatures below 40 deg. F (4 deg. C) are predicted for a period of 24-hours. 4. Earlier than 24-hours after surfaces became wet. 5. Substrate is frozen or surface temperature is less than 40 deg. F (4 deg. C). 6. Windy condition such that repellent may be blown to vegetation or substrates not intended. A. Warranty: Submit a written warranty, executed by the Applicator and water repellent manufacturer covering materials and labor, agreeing to repair or replace materials that fail to provide water repellency within the specified warranty period. This warranty shall be in addition to, and not a limitation of, other rights the Owner may have against the contractor under the contract documents. 1. Warranty Period: 5-years from date of Substantial Completion. PART 2 - PRODUCTS 2.01 MANUFACTURERS A. Products: Subject to compliance with requirements, provide one of the following: 1. Silane, 20 Percent Solids: Sil-Act ATS 22, Advanced Chemical Technologies. Aridox 20, Anti Hydro Company, Inc. Versaseal "S" 20, Applied Polymers of America, Inc. Weather Worker S-20, Dayton Superior Corp. Chem-Trete BSM 20, Huls America Inc. Hydrozo Enviroseal 20, Hydrozo Inc. Pentane, L & M Construction Chemicals, Inc. Klere-Seal 920-S, Pecora Corporation. Penetrating Sealer 20, Sonneborn Building Products. Stontite S19 20, Stonhard, Inc. Baracade Silane 20 Percent, Tamms Industries. Rainstopper 120, Textured Coatings of America, Inc.

4 2. Siloxane: 2.02 WATER REPELLENTS Prime-A-Pell 200, Chemprobe Corporation. Euco Weather-Guard, The Euclid Chemical Company. Dynatrete, Huls America, Inc. Shed OX, L & M Construction Chemicals, Inc. Klere-Seal 908-SX, Pecora Corporation. Weather Seal Siloxane, ProSoCo, Inc. Stontite SX9, Stonhard, Inc. Baracade SMS 250, Tamms Industries Co. Rainstopper 1500, Textured Coatings of America, Inc. A. Silane, 20 Percent Solids: Penetrating water repellent. A monomeric compound containing approximately 20 percent alkyltrialkoxysilanes with alcohol, mineral spirits, water, or other proprietary solvent carrier. B. Siloxanes: Penetrating water repellent. Alkylalkoxysiloxanes that are oligomerous with alcohol, ethanol, mineral spirits, water, or other proprietary solvent carrier. PART 3 - EXECUTION 3.01 PREPARATION A. Clean substrate of substances that might interfere with penetration or performance of water repellents. Test for moisture content, according to repellent manufacturer's instructions to ensure that surface is sufficiently dry. B. Test for ph level, according to repellent manufacturer's instructions to ensure chemical bond to silicates minerals. C. Protect adjoining work, including sealant bond surfaces, from spillage or blow-over of water repellent. Cover adjoining and nearby surfaces of aluminum and glass where there is the possibility of the water repellent being deposited on surfaces. Cover live plants and grass. Immediately clean water repellent from adjoining surfaces, complying with manufacturer's cleaning recommendations. D. Coordination with Sealants: Do not apply water repellent until the sealants for joints adjacent to surfaces receiving water repellent treatment have been installed and cured.

5 3.02 INSTALLATION 1. Water repellent work may precede sealant application only if sealant adhesion and compatibility have been tested and verified using substrate, water repellent, and sealant materials identical to those used in the work. A. Apply a heavy-saturation spray coating of water repellent on surfaces indicated for treatment using low-pressure spray equipment. Comply with manufacturer's instructions and recommendations using airless spraying procedure unless otherwise indicated. B. Apply a second saturation spray coating, repeating first application. Comply with manufacturer's instructions for limitations on drying time between coats and after rainstorm wetting of surfaces between coats. Consult manufacturer's technical representative if printed recommendations are not applicable to Project conditions. C. Remove protective coverings from adjacent surfaces. **END OF SECTION**